One who quacks. / (slang) A playing card with the rank of two; a duck.

(nonce word, humorous) comparative form of quack: more quack.

plural of quacker

(uncommon, possibly dated) Alternative form of Quaker

(law, medicine, uncountable) The practice of fraudulent medicine, usually in order to make money or for ego gratification and power; health fraud.

plural of quackery